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KZ900 Spark Plug Recommendations
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KZ900 Spark Plug Recommendations 26 Jul 2021 10:35 #852574

  • Lebowski
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76-KZ900 here. Do any of you guys foresee an issue with using BP8ES instead of B8ES for my bike? I believe the only difference is that the BP8ES are extended, so I would think clearance with the piston would be the only problem if there was one? If this is not an issue, my next question is what  spark plug boots do you recommend?

Thanks

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KZ900 Spark Plug Recommendations 26 Jul 2021 10:59 #852577

  • 650ed
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Clearly I do not understand.  Why would you not use the spark plug that the folks who designed the engine recommend?  Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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KZ900 Spark Plug Recommendations 26 Jul 2021 11:48 #852581

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Fair point. Because I happen to have a set of BP8ES available. 

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KZ900 Spark Plug Recommendations 26 Jul 2021 12:12 #852582

  • hardrockminer
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...and they no longer make the B8ES plug.....unfortunately.
I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.

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KZ900 Spark Plug Recommendations 26 Jul 2021 14:10 #852588

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ND W24ES are what I use in my KZ1000A1
Back in the saddle and loving it! KZ1000A1

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KZ900 Spark Plug Recommendations 26 Jul 2021 16:21 #852599

  • Nessism
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W24ES & W24ESU are good if you can't find B8ES.  Stay clear of BR8ES if you can since it has a resistor built in.

NGK plug caps are similar to the OEM caps.  They have a resistor built in (thus the plug doesn't need one.)  

The stock wires are copper core.  Not suppression core, like car wires, which are resistance type.  

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KZ900 Spark Plug Recommendations 26 Jul 2021 17:59 #852602

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...and they no longer make the B8ES plug.....unfortunately.



 

Perhaps, but apparently the B8ES plugs are still available.

www.amazon.com/NGK-B8ES-Standard-Spark-Plug/dp/B000A8OVIY
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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KZ900 Spark Plug Recommendations 26 Jul 2021 21:58 #852610

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I asked my local motorcycle dealer about the availability and production of the NGK B8ES. He knows nothing about it and can order as much as he wants (the Netherlands) 

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KZ900 Spark Plug Recommendations 27 Jul 2021 04:04 #852614

  • hardrockminer
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You may be correct Ed.  But I've heard from several sources that they are stopping production.  It's been discussed here.  I wouldn't trust Amazon to sell NGK plugs made by NGK in Japan.  Fake NGK plugs are known to exist.

Edited to add that if they are still made, and that's the OEM plug of choice then that''s what I would use.
I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.

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KZ900 Spark Plug Recommendations 27 Jul 2021 04:07 #852615

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NGK plug caps are similar to the OEM caps.  They have a resistor built in (thus the plug doesn't need one.)  

NGK makes non-resistor caps as well in all the same angles as the resistor cap. Other than the part number etched onto the side I couldn’t tell them apart visually. I think Z1 Enterprises used to carry the full range of styles, not sure if they do anymore or not. Maybe it was Dennis Kirk?
1976 KZ900A4 (1105 Project)
1976 KZ900A4 (Stock Project)
1978 KZ1000A2 (Completed Project)
1983 ZX750 A1 aka GPz 750 (Completed Project)
1983 ZX750 A1 (Almost Road-Ready)
1973 CL350K4 (Completed Project)

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KZ900 Spark Plug Recommendations 27 Jul 2021 05:19 #852617

  • TexasKZ
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Z1 still lists the caps, but no non-resistor plugs.

www.z1enterprises.com/ngk-spark-plug-cap...ree-elbow-yb05f.html
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

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KZ900 Spark Plug Recommendations 27 Jul 2021 05:26 #852619

  • TexasKZ
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Claims to be an NGK crossover chart.

www.weeksmotorcycle.com/spark_plug.html#gsc.tab=0
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

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